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10% solution [Jun. 29th, 2011|09:29 pm]
Chemistry Help

chemistryhelp

[sarah1234567891]
HI

I need to make  10% formic acid   (my formic acid has a 88% purity)


i'm confused as to how to do this. let's use 100 mL to make it easier to calculate.


Do I:

A.  10 mL formic acid + 90 mL H20

or

B. 10 mL formic + 100 mL H2O?


When do I use A and when do I use B to calculate?



I was making a 0.1% Formic acid in water 1 L solution, I used calculation B to make the solution.  1.14 mL of formic acid + 1000mL H2O.
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Comments:
[User Picture]From: superhimik
2011-07-01 10:10 am (UTC)
Neither A, no B.

It's better to calculate so.
100 g 10 % solution contain 10 g of acid.
So you are to mix 10/0,88=11,36 g of 88 % acid and 100 g - 11,36 g = 88,64 g of water.
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